package com.hongfasoft.util;

import java.io.InputStream;
import java.io.Writer;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

import uniesb.sdk.util.JSON;

import com.hongfasoft.wx.message.Article;
import com.hongfasoft.wx.message.CustomerServiceMessage;
import com.hongfasoft.wx.message.MusicMessage;
import com.hongfasoft.wx.message.NewsMessage;
import com.hongfasoft.wx.message.TextMessage;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.core.util.QuickWriter;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
import com.thoughtworks.xstream.io.json.JettisonMappedXmlDriver;
import com.thoughtworks.xstream.io.json.JsonHierarchicalStreamDriver;
import com.thoughtworks.xstream.io.json.JsonWriter;
import com.thoughtworks.xstream.io.xml.PrettyPrintWriter;
import com.thoughtworks.xstream.io.xml.XppDriver;

/**
 * 消息工具类
 * 
 * @author liufeng
 * @date 2013-05-19
 */
public class MessageUtil
{

	/**
	 * 返回消息类型：文本
	 */
	public static final String RESP_MESSAGE_TYPE_TEXT = "text";

	/**
	 * 返回消息类型：音乐
	 */
	public static final String RESP_MESSAGE_TYPE_MUSIC = "music";

	/**
	 * 返回消息类型：图文
	 */
	public static final String RESP_MESSAGE_TYPE_NEWS = "news";

	/**
	 * 请求消息类型：文本
	 */
	public static final String REQ_MESSAGE_TYPE_TEXT = "text";

	/**
	 * 请求消息类型：文本
	 */
	public static final String REQ_MESSAGE_TYPE_SERVICE = "transfer_customer_service";
	
	/**
	 * 请求消息类型：图片
	 */
	public static final String REQ_MESSAGE_TYPE_IMAGE = "image";

	/**
	 * 请求消息类型：链接
	 */
	public static final String REQ_MESSAGE_TYPE_LINK = "link";

	/**
	 * 请求消息类型：地理位置
	 */
	public static final String REQ_MESSAGE_TYPE_LOCATION = "location";

	/**
	 * 请求消息类型：音频
	 */
	public static final String REQ_MESSAGE_TYPE_VOICE = "voice";

	/**
	 * 请求消息类型：音频
	 */
	public static final String REQ_MESSAGE_TYPE_VIDEO = "video";

	/**
	 * 请求消息类型：推送
	 */
	public static final String REQ_MESSAGE_TYPE_EVENT = "event";

	/**
	 * 事件类型：subscribe(订阅)
	 */
	public static final String EVENT_TYPE_SUBSCRIBE = "subscribe";

	/**
	 * 事件类型：unsubscribe(取消订阅)
	 */
	public static final String EVENT_TYPE_UNSUBSCRIBE = "unsubscribe";

	/**
	 * 事件类型：CLICK(自定义菜单点击事件)
	 */
	public static final String EVENT_TYPE_CLICK = "CLICK";

	/**
	 * 解析微信发来的请求（XML）
	 * 
	 * @param request
	 * @return
	 * @throws Exception
	 */
	@SuppressWarnings("unchecked")
	public static Map<String, String> parseXml(HttpServletRequest request) throws Exception
	{
		// 将解析结果存储在HashMap中
		Map<String, String> map = new HashMap<String, String>();

		// 从request中取得输入流
		InputStream inputStream = request.getInputStream();
		// 读取输入流
		SAXReader reader = new SAXReader();
		Document document = reader.read(inputStream);
		// 得到xml根元素
		Element root = document.getRootElement();
		// 得到根元素的所有子节点
		List<Element> elementList = root.elements();

		// 遍历所有子节点
		for (Element e : elementList)
			map.put(e.getName(), e.getText());

		// 释放资源
		inputStream.close();
		inputStream = null;

		return map;
	}

	/**
	 * 文本消息对象转换成xml
	 * 
	 * @param textMessage
	 *            文本消息对象
	 * @return xml
	 */
	public static String textMessageToXml(TextMessage textMessage)
	{
		xstream.alias("xml", textMessage.getClass());
		return xstream.toXML(textMessage);
	}

	/**
	 * 音乐消息对象转换成xml
	 * 
	 * @param musicMessage
	 *            音乐消息对象
	 * @return xml
	 */
	public static String musicMessageToXml(MusicMessage musicMessage)
	{
		xstream.alias("xml", musicMessage.getClass());
		return xstream.toXML(musicMessage);
	}
	
	/**
	 * 音乐消息对象转换成xml
	 * 
	 * @param musicMessage
	 *            音乐消息对象
	 * @return xml
	 */
	public static String customerServiceMessageToXml(CustomerServiceMessage customerMessage)
	{
		xstream.alias("xml", customerMessage.getClass());
		return xstream.toXML(customerMessage);
	}

	/**
	 * 图文消息对象转换成xml
	 * 
	 * @param newsMessage
	 *            图文消息对象
	 * @return xml
	 */
	public static String newsMessageToXml(NewsMessage newsMessage)
	{
		xstream.alias("xml", newsMessage.getClass());
		xstream.alias("item", new Article().getClass());
		return xstream.toXML(newsMessage);
	}

	/**
	 * 扩展xstream，使其支持CDATA块
	 * 
	 * @date 2013-05-19
	 */
	private static XStream xstream = new XStream(new XppDriver()
	{
		public HierarchicalStreamWriter createWriter(Writer out)
		{
			return new PrettyPrintWriter(out)
			{
				// 对所有xml节点的转换都增加CDATA标记
				boolean cdata = true;

				@SuppressWarnings("rawtypes")
				public void startNode(String name, Class clazz)
				{
					super.startNode(name, clazz);
				}

				protected void writeText(QuickWriter writer, String text)
				{
					if (cdata)
					{
						writer.write("<![CDATA[");
						writer.write(text);
						writer.write("]]>");
					} else
					{
						writer.write(text);
					}
				}
			};
		}
	});

	// --------------------------------------------json-----------------------------------
	private static XStream jsonxstream = new XStream(new JsonHierarchicalStreamDriver()
	{
		public HierarchicalStreamWriter createWriter(Writer writer)
		{
			return new JsonWriter(writer, JsonWriter.DROP_ROOT_MODE);
		}
	});
	

	public static String jsonToLowKey(String json) throws Exception
	{
		HashMap m = JSON.toMap(json);
		HashMap result = new HashMap();
		Iterator<Entry> it = m.entrySet().iterator();
		while(it.hasNext()){
			Entry e = it.next();
			result.put(e.getKey().toString().toLowerCase(), e.getValue());
		}
		return JSON.toJSON(result);
	}

	/**
	 * 文本消息对象转换成xml
	 * 
	 * @param textMessage
	 *            文本消息对象
	 * @return xml
	 * @throws Exception 
	 */
	public static String textMessageToJSON(TextMessage textMessage) throws Exception
	{
		jsonxstream.setMode(XStream.NO_REFERENCES);
		return jsonToLowKey(xstream.toXML(textMessage));
	}

	/**
	 * 音乐消息对象转换成xml
	 * 
	 * @param musicMessage
	 *            音乐消息对象
	 * @return xml
	 * @throws Exception 
	 */
	public static String musicMessageToJSON(MusicMessage musicMessage) throws Exception
	{
		jsonxstream.setMode(XStream.NO_REFERENCES);
		return jsonToLowKey(xstream.toXML(musicMessage));
	}

	/**
	 * 图文消息对象转换成xml
	 * 
	 * @param newsMessage
	 *            图文消息对象
	 * @return xml
	 * @throws Exception 
	 */
	public static String newsMessageToJson(NewsMessage newsMessage) throws Exception
	{
		jsonxstream.setMode(XStream.NO_REFERENCES);
		return jsonToLowKey(xstream.toXML(newsMessage));
	}

}
